blk-iocost: Fix typo in comment

soley -> solely
Signed-off-by: Kemeng Shi <shikemeng@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20221018121932.10792-2-shikemeng@huawei.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-iocost.c

@@ -111,7 +111,7 @@
  * busy signal.
  *
  * As devices can have deep queues and be unfair in how the queued commands
- * are executed, soley depending on rq wait may not result in satisfactory
+ * are executed, solely depending on rq wait may not result in satisfactory
  * control quality.  For a better control quality, completion latency QoS
  * parameters can be configured so that the device is considered saturated
  * if N'th percentile completion latency rises above the set point.